the rears dont count as 2 speakers "technically", the one 4 inch is your highs and the 6x9 is your low pass bass, kinda like a componet set. there is no need to do that many speakers. Add some nice coax's or componets in the fronts, 6.5's if you want a lil more bass, then some nice 3 ways like the above stated and you you'll be just fine. Get a 4 channel and a mono, and a nice deck with 3 rca's with 4 volt preouts and you'll be good to go.